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CN105594277B - Method and apparatus for using resources for D2D operation in a wireless communication system - Google Patents

Method and apparatus for using resources for D2D operation in a wireless communication system Download PDF

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Publication number
CN105594277B
CN105594277B CN201480054569.4A CN201480054569A CN105594277B CN 105594277 B CN105594277 B CN 105594277B CN 201480054569 A CN201480054569 A CN 201480054569A CN 105594277 B CN105594277 B CN 105594277B
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rrc
resource
signal
idle
network
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CN105594277A (en
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郑圣勋
李英大
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method and apparatus for using resources for device-to-device (D2D) operation in a wireless communication system are provided. A User Equipment (UE) receives D2D resources for transmission of D2D signals in a Radio Resource Control (RRC) idle mode and transmits D2D signals using D2D resources in the RRC idle mode. The D2D resource may be used only in the RRC idle mode or may be used after entering the RRC connected mode. Alternatively, the UE receives the D2D resource for transmission of the D2D signal in the RRC connected mode and transmits the D2D signal using the D2D resource in the RRC idle mode.

Description

The method and apparatus of the resource for D2D operation is used in wireless communication system
Technical field
The present invention relates to wireless communications, more particularly, are related to a kind of in a wireless communication system using for device pair The method and apparatus of the resource of device (D2D) operation.
Background technique
Universal Mobile Telecommunications System (UMTS) is moved according to the wideband code division multiple access (WCDMA) based on European system, the whole world The third generation (3G) asynchronous mobile communiation system of dynamic communication system (GSM) and General Packet Radio Service (GPRS) operation.It is right The third generation partner program (3GPP) that UMTS is standardized is discussing the long term evolution (LTE) of UMTS.
3GPP LTE is a kind of technology for allowing high speed packet communication.It has been directed to LTE purpose and has proposed many schemes, including It is intended to reduce user and supplier's cost, improves service quality and expansion and improves those of coverage area and power system capacity side Case.It is required as upper layer, 3GPP LTE needs to reduce every bit cost, increases service availability, flexible service band, structure letter The power consumption appropriate of single, open interface and terminal.
Recently, surging to the concern for supporting on-line equipment to communicate device (D2D).This new concern is by Multiple factors Excitation, universal (being driven by social networking application) of the service including being based on neighbouring (proximity), The underutilization of overwhelming data requirements and uplink band to most of cellular frequency spectrums for local service.3GPP Target be in LTE version 12 D2D communication availability so that LTE can become be used for by what the first respondent used The competitive broadband communications technologies of public safety network.Due to traditional problem and budgetary restraints, current public safety net Network is still based primarily upon out-of-date 2G technology, and commercial network is quickly shifted to LTE.This evolution gap and to enhancing service Expectation result in the whole world for upgrading existing public safety network attempted.Compared with commercial network, public safety network tool There is more strict service request (for example, reliability and safety), and it also requires direct communication, especially when honeycomb covers When failing or be unavailable.Lack this necessary Direct Model feature in LTE at present.
From the angle of technology, developing the naturally neighbouring of communication service can provide multiple performance benefits.Firstly, since short distance Direct communication, D2D user equipment (UE) can enjoy high data rate and the delay of low side opposite end.Secondly, with evolution NodeB is passed through (eNB) it carries out routing with possible core network to compare, neighbouring UE directly communicates with each other more efficient for resource.Specifically It says, compared with normal downlink/uplink cell communication, direct communication saves energy and improves radio resource utilization Rate.Third switches to directapath from infrastructure path and unloads cellular services, to alleviate congestion, therefore also advantageous In other non-D2D UE.It is contemplated that other benefits, such as expands via the range that UE to UE is relayed.
Redefinable is used for the radio resource of D2D transmission.Radio resource for D2D transmission can be according to UE's Radio resource control (RRC) state (that is, RRC idle mode and RRC connection mode) uses.One kind is needed to be efficiently used The method of resource for D2D operation.
Summary of the invention
Technical problem
The present invention provides a kind of in a wireless communication system using the side of the resource operated for device to device (D2D) Method and equipment.The present invention provides one kind to control D2D operation and/or D2D resource based on radio resource control (RRC) state Applicability method.The present invention provides one kind is utilized in the rrc-idle mode in RRC idle mode or RRC connection mode Under the received D2D resource method that sends D2D signal.
Solution to the problem
On the one hand, it provides a kind of used in a wireless communication system by user equipment (UE) and is used for device to device (D2D) method of the resource operated.Method includes the following steps: being received under radio resource control (RRC) idle mode The D2D resource of transmission for D2D signal；And the D2D is sent using the D2D resource under the RRC idle mode Signal.
On the other hand, the user equipment (UE) in a kind of wireless communication system is provided.The UE includes: radio frequency (RF) Unit is used to send or receive radio signal；And processor, it is attached to the RF unit and is configured as in nothing Line electric resources, which control to receive under (RRC) idle mode, is used for device to the D2D resource of the transmission of device (D2D) signal, and The D2D signal is sent using the D2D resource under the RRC idle mode.
On the other hand, it provides a kind of used in a wireless communication system by user equipment (UE) and is used for device to device (D2D) method of the resource operated.Method includes the following steps: being received under radio resource control (RRC) connection mode The D2D resource of transmission for D2D signal；And the D2D is sent using the D2D resource under the RRC idle mode Signal.
Advantageous effect of the invention
D2D signal can be effectively sent in the rrc-idle mode.
Detailed description of the invention
Fig. 1 shows LTE system framework.
Fig. 2 shows the block diagrams of typical E-UTRAN and the framework of typical case EPC.
Fig. 3 shows the user-plane protocol stack of LTE system and the block diagram of control plane protocol stack.
Fig. 4 shows the example of physical channel structure.
Fig. 5 and Fig. 6 shows ProSe direct communication scene in the case where no relaying.
Fig. 7 shows the frame of reference for ProSe.
Fig. 8 shows the example of the direct discovery procedure of single step ProSe.
Fig. 9 shows the example of the direct discovery procedure of two-step type ProSe.
Figure 10 shows the example of the method for the transmission D2D signal of embodiment according to the present invention.
Figure 11 shows the example of the method for the transmission D2D signal of another embodiment according to the present invention.
Figure 12 is the block diagram for showing the wireless communication system for realizing embodiments of the present invention.
Specific embodiment
Following technologies can be used in such as CDMA (CDMA), frequency division multiple access (FDMA), time division multiple acess (TDMA), orthogonal frequency Divide in the various wireless communication systems of multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA) etc..CDMA is using such as logical The radio technology of (UTRA) or CDMA-2000 are accessed with terrestrial radio to realize.TDMA is mobile logical using such as whole world Letter system (GSM)/General Packet Radio Service (GPRS)/enhancing data rate GSM evolution (EDGE) radio technology is come It realizes.OFDMA is using such as Institute of Electrical and Electric Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), the radio technology of IEEE 802.20, evolution UTRA (E-UTRA) etc. is realized.IEEE 802.16m is from IEEE 802.16e evolution, and the back compatible with the system based on IEEE 802.16e is provided.UTRA is universal mobile telecommunications system A part of system (UMTS).3rd generation partner program (3GPP) long term evolution (LTE) is the evolution UMTS using E-UTRA (E-UMTS) a part.3GPP LTE uses OFDMA in the downlink, uses SC-FDMA in the uplink.LTE- Advanced (LTE-A) is the evolution of LTE.
It will focus on LTE-A for clarity, being described below.However, technical characteristic of the invention is without being limited thereto.
Fig. 1 shows LTE system framework.Communication network is widely deployed such as internet to be provided by IMS and packet data The various communication services of protocol voice (VoIP).
Referring to Fig.1, LTE system framework includes one or more user equipment (UE；10), evolution UMTS terrestrial radio Access network (E-UTRAN) and evolution block core (EPC).UE 10 refers to the communication equipment carried by user.UE 10 can be with It is fixed or mobile, and can be referred to such as movement station (MS), user terminal (UT), subscriber station (SS), wireless device Deng another term.
E-UTRAN includes one or more evolution node Bs (eNB) 20, and multiple UE can be located in a cell.eNB 20 The endpoint of control plane and user plane is provided to UE 10.ENB 20 is usually and the fixed station communicated of UE 10 and can be claimed Make another term of base station (BS), base station transceiver system (BTS), access point etc..Every cell can dispose an eNB 20. There are one or more cells in the coverage area of eNB 20.Single subdistrict be configured with from 1.25MHz, One of the bandwidth selected in 2.5MHz, 5MHz, 10MHz and 20MHz etc., and downlink or uplink are provided to multiple UE Road transmission service.In this case, different cells can be configured to provide different bandwidth.
Hereinafter, downlink (DL) indicate from eNB 20 to UE 10 communication, uplink (UL) indicate from UE 10 to The communication of eNB 20.In DL, transmitter can be a part of eNB 20, and receiver can be a part of UE 10.In UL In, transmitter can be a part of UE 10, and receiver can be a part of eNB 20.
EPC includes the mobility management entity (MME) for being responsible for control plane function and responsible user-plane function is System architecture evolution (SAE) gateway (S-GW).MME/S-GW 30 can be located at the end of network and be connected to external network.MME tool There are UE access information or UE ability information, these information may be used primarily for UE mobile management.S-GW is that endpoint is E-UTRAN Gateway.MME/S-GW 30 provides the session of UE 10 and the endpoint of mobile management function to ps domain.EPC may also include packet data network (PDN) gateway (PDN-GW).PDN-GW is the gateway that endpoint is PDN.
MME provides various functions, including non access stratum (NAS) signaling, the NAS signaling safety, access layer to eNB 20 Face (AS) security control, ambulant core network (CN) the intermediate node signaling between 3GPP access network, idle mode UE accessibility (control and execution that retransmit including paging), tracking zone list management are (in idle and activity pattern UE), P-GW and S-GW selection, the MME for changing switching with MME are selected, for accessing network switching to 2G or 3G 3GPP Serving GPRS Support Node (SGSN) selection, roaming, certification, bearer management function (including dedicated bearer establish), to public police The transmission of reporting system (PWS) (including earthquake and tsunami warning system (ETWS) and business mobile alarm system (CMAS)) message It supports.S-GW host provides various functions, (examines for example, by deep packet including the packet filtering based on each user Look into), Lawful Interception, the distribution of the UE Internet protocol address (IP), the transfer level packet marking in DL, UL and DL service class meter Take, the enhancing of thresholding and rate, the DL rate enhancing based on APN-AMBR.For clarity, MME/S-GW 30 will be by referred to as herein For " gateway ", it will be understood that, this entity includes both MME and S-GW.
It can be used for sending customer service or controlling the interface of business.UE 10 and eNB 20 can be connected by Uu interface It connects.ENB 20 is interconnected by X2 interface.Neighbouring eNB can have mesh network structure, with X2 interface.ENB 20 passes through S1 Interface is connected to EPC.ENB 20 is connected to MME by S1-MME interface, and is connected to S-GW by S1-U interface.S1 interface Support the many-to-many relationship between eNB 20 and MME/S-GW.
Fig. 2 shows the block diagrams of typical E-UTRAN and the framework of typical case EPC.Referring to Fig. 2, the executable selection gateway of eNB 20 30, towards the routing of gateway 30, the scheduling of paging message and transmission, broadcast channel during radio resource control (RRC) activation (BCH) scheduling and transmission of information, in UL and DL the two to the dynamic allocation of the resource of UE 10, eNB measure configuration and mention For the connection mobility control under the control of, radio bearer, radio admission control (RAC) and LTE_ACTIVE state Function.In EPC, as described above, the executable paging initiation of gateway 30, the encryption of LTE_IDLE condition managing, user plane, The function of SAE carrying control and the encryption of NAS signaling and integrity protection.
Fig. 3 shows the user-plane protocol stack of LTE system and the block diagram of control plane protocol stack.Fig. 3-(a) shows LTE The block diagram of the user-plane protocol stack of system, Fig. 3-(b) show the block diagram of the control plane protocol stack of LTE system.
The layer of radio interface protocol between UE and E-UTRAN can be based on well known open system interconnection in communication system (OSI) three layers are divided into first layer (L1), the second layer (L2) and third layer (L3) below model.Between UE and E-UTRAN Radio interface protocol can be horizontally divided into physical layer, data link layer and network layer, and work can be vertically divided into For the control plane (C plane) of the protocol stack for controlling signal transmission and as the protocol stack for data information transfer User plane (U plane).The layer of radio interface protocol is present in couples at UE and E-UTRAN, and is responsible for Uu interface Data transmission.
Physics (PHY) layer belongs to L1.PHY layer provides information transmission service to high level by physical channel.PHY layers pass through Transmission channel is connected to high-rise medium access control (MAC) layer as PHY layer.Physical channel is mapped to transmission channel. Data are transmitted by transmission channel between MAC layer and PHY layer.In different PHY layer (that is, the PHY layer of transmitter and connecing The PHY layer of receipts machine) between using radio resource data are transmitted by physical channel.Physical channel utilizes orthogonal frequency division multiplexing (OFDM) scheme is modulated, and uses time and the frequency as radio resource.
PHY layer uses multiple physical control channels.Physical downlink control channel (PDCCH) reports paging channel to UE (PCH) and the resource allocation of downlink sharied signal channel (DL-SCH) and hybrid automatic repeat-request related with DL-SCH (HARQ) information.PDCCH can carry the UL license of the resource allocation for transmitting to UE report UL.Physical control format indicator Quantity of the channel (PCFICH) to UE report for the OFDM symbol of PDCCH, and sent in each subframe.Physics is mixed It closes ARQ indicator channel (PHICH) and carries HARQ confirmation (ACK)/negative confirmation (NACK) signal in response to UL transmission.Object Uplink control channel (PUCCH) carrying is managed such as HARQ ACK/NACK of DL transmission, the UL of scheduling request and CQI Control information.Physical uplink shared channel (PUSCH) carries UL uplink shared channel (SCH).
Fig. 4 shows the example of physical channel structure.Physical channel is by multiple subframes in time domain and multiple sons in frequency domain Carrier wave composition.One subframe is made of multiple symbols in time domain.One subframe is made of multiple resource blocks (RB).One RB by Multiple symbols and multiple subcarriers composition.In addition, the specific subcarrier of the special symbol of corresponding subframe can be used for by each subframe PDCCH.For example, the first symbol of subframe can be used for PDCCH.PDCCH carries such as dynamic allocation of Physical Resource Block (PRB) Resource and modulation and encoding scheme (MCS).Transmission Time Interval (TTI) as the unit time transmitted for data can wait In the length of a subframe.The length of one subframe can be 1ms.
Whether transmission channel is shared according to channel and is divided into Common transport channel and dedicated transmission channel.For from network The DL transmission channel that data are sent to UE includes for sending the broadcast channel of system information (BCH), for sending paging message Paging channel (PCH), for sending customer service or controlling the DL-SCH etc. of signal.DL-SCH supports HARQ, passes through variation Modulation, coding and the dynamic link adaptation and both dynamic and semi-persistent resource distribution that send power.DL-SCH can also permit Perhaps beam forming is broadcasted and used in entire cell.System information carries one or more system information blocks.All systems System block of information can be sent according to identical periodicity.The business or control signal of multimedia broadcast/multi broadcast business (MBMS) can It is sent by DL-SCH or Multicast Channel (MCH).
UL transmission channel for sending data from UE to network includes the random access for sending initial control message Channel (RACH), for sending customer service or controlling the UL-SCH etc. of signal.UL-SCH supports HARQ and by variation hair Send the dynamic link adaptation of power and possible modulation and coding.UL-SCH may also allow for using beam forming.RACH is usual For the initial access to cell.
MAC layer belongs to L2.MAC layer controls (RLC) layer to the high-rise radio link as MAC layer via logic channel Service is provided.MAC layer is provided multiple mapping logical channels to the function of multiple transmission channels.MAC layer by multiple also by patrolling It collects channel and maps to single transmission channel to provide the function of logic channel multiplexing.Media access control sublayer provides the data on logic channel Transmission service.
According to the type of transmitted information, logic channel be divided into for transmit control plane information control channel with And the Traffic Channel for transmitting user plane information.That is, transmitting one group of service definition for different data provided by MAC layer Logical channel type.Logic channel is located above transmission channel and is mapped to transmission channel.
Control channel is only used for the transmission of control plane information.It include Broadcasting Control letter by the control channel that MAC layer provides Road (BCCH), Paging Control Channel (PCCH), common control channel (CCCH), multicast control channel (MCCH) and dedicated control Channel (DCCH).BCCH is the downlink channel for broadcast system control information.PCCH is the downlink for transmitting paging information Link channel, and when being used in network and not knowing the cell where UE.CCCH is made by not having with the RRC of the network UE connecting With.MCCH is the point-to-multipoint downlink channel for sending MBMS control information from network to UE.DCCH is by having The point-to-point two-way channel that the UE of the RRC connection of dedicated control information is used is sent between UE and network.
Traffic Channel is only used for the transmission of user plane information.It include dedicated service letter by the Traffic Channel that MAC layer provides Road (DTCH) and Logical Traffic Channels (MTCH).DTCH is the point-to-point channel for being exclusively used in a UE transmission user information, and It may be present in uplink and downlink the two.MTCH is the point-to-multipoint for sending business datum from network to UE Downlink channel.
Uplink connection between logic channel and transmission channel includes the DCCH that can be mapped to UL-SCH, can be reflected It is incident upon the DTCH of UL-SCH and the CCCH of UL-SCH can be mapped to.Downlink between logic channel and transmission channel connects Connect including can be mapped to BCH or DL-SCH BCCH, PCH can be mapped to PCCH, can be mapped to DL-SCH's DCCH, the DTCH that DL-SCH can be mapped to, the MCCH that MCH can be mapped to and the MTCH that MCH can be mapped to.
Rlc layer belongs to L2.Rlc layer provide by will cascade and be segmented from high-rise received data in radio section come The size for adjusting data sends the function of data to be suitable for lower layer.In addition, in order to ensure needed for radio bearer (RB) Various service quality (QoS), rlc layer provide three kinds of operation modes, that is, transparent mode (TM), unacknowledged mode (UM) and really Recognize mode (AM).AM RLC provides functions of retransmission by automatic repeat request (ARQ) to be used for reliable data transmission.In addition, The function of rlc layer can be realized using the functional block inside MAC layer.In this case, rlc layer may not be present.
Packet data convergence protocol (PDCP) layer belongs to L2.The function of PDCP layers of offer head compression function, the function are reduced Unnecessary control information, so that can be via with relatively small using the data that IP grouping (for example, IPv4 or IPv6) is sent The radio interface of bandwidth is effectively sent.Head compression increases radio by only sending necessary information in the head of data Efficiency of transmission in section.In addition, PDCP layers of offer security function.Security function include prevent the encryption of third-party interception with And prevent the integrity protection of third-party data manipulation.
Radio resource control (RRC) layer belongs to L3.Rlc layer is located at the lowest part of L3, and it is flat to be only defined in control In face.Rrc layer plays the role of controlling radio resource between UE and network.For this purpose, UE and network are exchanged by rrc layer RRC information.Rrc layer control and the configuration of RB reconfigure and discharge related logic channel, transmission channel and physical channel. RB is to be provided by L1 and L2 with the logical path for the data transmission between UE and network.That is, RB indicates to be used for UE and E- The service of the offer L2 of data transmission between UTRAN.The configuration of RB means specified radio protocol layers and channel properties to mention For the processing of special services and determining corresponding detail parameters and operation.RB is divided into two types, that is, signaling RB (SRB) With data RB (DRB).SRB is used as the path for sending RRC information in the control plane.DRB, which is used as to send in user plane, to be used The path of user data.
Referring to Fig. 3-(a), RLC and MAC layer (terminating in eNB in network side) executable such as scheduling, autonomous retransmission are asked Seek the function of (ARQ) and hybrid automatic repeat-request (HARQ).PDCP layers (being terminated in eNB in network side) executable such as heads It compresses, the user-plane function of integrity protection and encryption.
Referring to Fig. 3-(b), RLC and MAC layer (terminating in eNB in network side) can execute identical function for control plane Energy.The executable such as broadcast of rrc layer (being terminated in eNB in network side), paging, RRC connection management, RB control, mobility function The function of energy and UE measurement report and control.NAS control protocol (in the MME that network side terminates at gateway) is executable such as Paging under SAE bearer management, certification, the processing of LTE_IDLE mobility, LTE_IDLE is initiated and between gateway and UE Signaling security control function.
Whether the rrc layer of RRC state instruction UE is logically connected to the rrc layer of E-UTRAN.RRC state may be logically divided into two The different state of kind, such as RRC connection status and RRC idle state.It is built when between the RRC layer and the rrc layer of E-UTRAN of UE When vertical RRC connection, UE is in RRC_CONNECTED, and otherwise UE is in RRC_IDLE.Due to being in the UE of RRC_CONNECTED It establishes RRC with E-UTRAN to connect, so E-UTRAN can recognize the presence of the UE in RRC_CONNECTED and can have Effect ground controls the UE.In addition, the UE in RRC_IDLE can not be identified that CN (is the area bigger than cell with TA by E-UTRAN Domain) it is unit to manage UE.That is, only identifying the presence of the UE in RRC_IDLE as unit of big region, UE must change The typical mobile communication service of such as voice or data communication is received for RRC_CONNECTED.
In rrc-idle state, UE is specified in UE by the NAS discontinuous reception (DRX) configured and UE has been assigned The broadcast of acceptable system information and paging information while uniquely identifying mark (ID) of UE in tracing area, and Executable public land mobile network (PLMN) selection and cell reselection.In addition, in rrc-idle state, not deposited in eNB Store up RRC context.
In rrc -- connected state, UE has the context in E-UTRAN RRC connection and E-UTRAN, so that can Data are sent to eNB and/or receive data from eNB.In addition, UE can be to eNB reporting channel quality information and feedback information.? Under RRC_CONNECTED state, E-UTRAN knows cell belonging to UE.Therefore, network can to UE send data and/or from UE receives data, and network can control the mobility of UE (to connect using network assisted cell change (NACC) to GSM EDGE radio Enter Cell Change Order between the switching of network (GERAN) and radio access technologies (RAT)), and network is executable neighbouring small The cell measurement in area.
In rrc-idle state, UE specifies paging DRX circulation.In particular, UE is followed in the specific paging DRX of each UE The specific paging occasion of ring monitors paging signal.Paging occasion is to send the time interval of paging signal.UE has own Paging occasion.
Paging message is sent via all cells for belonging to same tracing area.If UE moves to another from a TA TA, then UE will send tracking area update (TAU) message to network to update its position.
When user is initially turned on the power supply of UE, UE searches for appropriate cell first, is then maintained in the cell RRC_IDLE.When needing to establish RRC connection, the UE for being maintained at RRC_IDLE passes through the RRC of RRC connection procedure and E-UTRAN RRC connection is established, RRC_CONNECTED then can be changed into.When call attempt due to user etc. and it is necessary to carry out uplink When link data transfer or when needing to send response message when receiving paging message from E-UTRAN, it is maintained at RRC_ The UE of IDLE, which may need to establish RRC with E-UTRAN, to be connect.
It is known that different reason values can be mapped between UE and eNB send message signature sequence and Channel quality indicator (CQI) or path loss and reason or message size are for including the time in initial preamble Choosing.
When UE desires access to network and the determination message to be sent, which can be linked to purpose and can determine Cause value.It can also be determined by identifying all optional informations and different alternative size (for example, by removing optional information) The size of ideal message, or alternative scheduling request information can be used.
UE obtains the necessary information of the transmission for lead code, UL interference, pilot tone transmission power and examines at receiver Signal-to-noise ratio (SNR) needed for surveying lead code or a combination thereof.This information must be allowed for calculating the initial transmission power of lead code.From The angle of frequency is it is beneficial that send UL message, near lead code to ensure transmission of the identical channel for message.
UE should consider UL interference and UL path loss to ensure that network receives lead code with minimum SNR.UL interference can It only determines in the enb, therefore, it is necessary to be broadcasted by eNB and received by UE before transmitting the preamble.UL path loss can class DL path loss is similar to consider, and can be by UE from being received when UE knows the transmission power of some pilot frequency sequences of cell To RX signal strength estimate.
UL SNR needed for detection lead code will generally depend upon eNB configuration (for example, the quantity and receiver of Rx antenna Can).It may be advantageous that being sent out independently of power excursion required between variation UL interference and possible lead code and message Send the quite static transmission power and necessary UL SNR of pilot tone.
The initial transmission power of lead code can be calculated substantially according to the following formula:
Send power=transmission pilot tone-reception pilot tone+UL interference+offset+required SNR
Therefore, any combination that required SNR, UL interference can be broadcasted, send pilot tone and offset.In principle, it is only necessary to broadcast One value.This is substantially in current UMTS system, but the UL interference in 3GPP LTE will mainly adjacent cell interference (it may be more constant than in UMTS system).
UE determines that the initial UL of the transmission for lead code sends power as described above.Receiver in eNB can be estimated Absolutely receive power and the relative received power compared with the interference in cell.If the received signal compared with interference Power is higher than eNB known threshold, then eNB will be considered to detect lead code.
UE execution power is cumulative to ensure the transimission power deficiency even if the lead code of initial estimation, and UE can also be detected It arrives.If UE is not received by ACK or NACK before attempting next random access, will most possibly send another leading Code.The transmission power of lead code can be increased, and/or lead code can be sent in different UL frequencies to increase detection probability. Therefore, the actual transmission power for the lead code being detected is not necessarily corresponded to be originated by the first of lead code of UE initial calculation Send power.
UE must determine possible UL transformat.Transformat may include the resource block that MCS and UE should be used Quantity, transformat depend primarily on two parameters, in particular, SNR at eNB and the message to be sent is required big It is small.
In fact, maximum UE message size or payload and required minimum SNR correspond to each transformat.? In UMTS, UE determines whether that power, lead code and biography can be sent according to estimated initial preamble before transmitting the preamble It is required offset between defeated piece, maximum allowable or power, constant offset and extra margins can be sent with UE to be directed to transmission selection Transformat.Lead code in UMTS is not needed comprising any information about the selected transformat of UE, because network is not It needs to set aside some time and therefore frequency resource indicates transformat together with transmitted message.
ENB must be known by when receiving lead code UE be intended to send message size and the achievable SNR of UE so as to Correct transformat is selected, necessary time and frequency resource are then reserved.Therefore, eNB can not based on the received before Leading code estimates the achievable SNR of UE, as it is assumed that UE most possible will consider path loss or some measured in DL Equivalent metric determines initial preamble transimission power, eNB do not know with it is maximum allowable or may UE send power compared with UE Send power.
ENB can calculate the difference between the path loss of the path loss and UL estimated in compared DL.However, if Cumulative using power, the UE for lead code sends the UE transmission power that power does not correspond to initial calculation, then is not available for this Kind calculates.In addition, the precision that practical UE sends the transmission power that power and UE are intended to send is very low.Therefore, it has been proposed that will Path loss or the CQI estimation of downlink and the message size in UL or cause value encode in signature.
It describes adjacent service (ProSe).It can refer to 3GPP TR 23.703V0.4.1 (2013-06).ProSe can be packet Include the concept that device communicates device (D2D).Hereinafter, ProSe can be used in mixed way device (D2D) with device.
ProSe direct communication indicates between two or more UE of neighbouring enabling ProSe via not passing through any net The path of network node uses communication of the E-UTRA technology by user-plane transmissions.The UE for enabling ProSe indicates that ProSe is supported to want The UE for associated process of summing.Unless explicitly stated otherwise, the UE for otherwise enabling ProSe indicates not common safe UE and public affairs Both safe UE altogether.The public safety UE for enabling ProSe indicates also to support the specific ability of ProSe process and public safety institute Enabling ProSe UE.The not common safe UE for enabling ProSe indicates that ProSe process is supported not support public safety institute still The UE of specific ability.ProSe directly has found to indicate to be used by the UE for enabling ProSe through 3GPP LTE version 12E-UTRA Technology finds the process of other UE for enabling ProSe merely with the ability of two UE in its vicinity.EPC rank ProSe discovery table Show that EPC determines the neighbouring of the UE of two enabling ProSe and informs its neighbouring processing to it.
When the registered public land mobile network (PLMN) of consideration, ProSe direct communication path and covering state (covering In range or outside coverage area) when, there are multiple and different possibility scenes.It is contemplated that in immediate data path and coverage area With the various combination outside coverage area.
Fig. 5 and Fig. 6 shows ProSe direct communication scene in the case where no relaying.Fig. 5-(a) show UE1 and Situation of the UE2 outside coverage area.Fig. 5-(b) shows UE1 in coverage area and in PLMN A, and UE2 is in coverage area Outer situation.Fig. 5-(c) shows UE1 and UE2 in coverage area and in PLMN A, and UE1 and UE2 share it is identical PLMN A and the case where identical cell.Fig. 5-(d) shows UE1 and UE2 in coverage area and in identical PLMN A In, but situation of the UE1 and UE2 in cell different from each other.Fig. 6-(a) shows UE1 and UE2 in coverage area, still Situation of the UE1 and UE2 in PLMN (that is, PLMN A/B) different from each other and different cells.UE1 and UE2 is in two small In the coverage area in area.Fig. 6-(b) shows UE1 and UE2 in coverage area, but UE1 and UE2 is in PLMN different from each other Situation in (that is, PLMN A/B) and different cells.UE1 is in the coverage area of two cells, and UE2 is in serving cell In coverage area.Fig. 6-(c) shows UE1 and UE2 in coverage area, but UE1 and UE2 PLMN different from each other (that is, PLMN A/B) and different cells in situation.UE1 and UE2 is in the coverage area of the serving cell of their own.It is describing When above, " in coverage area and in PLMN A " indicates that UE is just preempting the cell of PLMN A and under the control of PLMN A.
It can support two different modes for one-to-one ProSe direct communication.
Network independence direct communication: this operation mode of ProSe direct communication does not need any network assistance come the company of authorization It connects, and executes communication merely with UE local functionality and information.This mode is only applicable to the enabling ProSe of pre-authorization Public safety UE, whether serviced by E-UTRAN but regardless of UE.
Network authorization direct communication: this operation mode of ProSe direct communication always needs network assistance, and for Public safety UE is also applicable when only one UE " being serviced by E-UTRAN ".For not common safe UE, two UE must " by E-UTRAN service ".
Fig. 7 shows the frame of reference for ProSe.Referring to Fig. 7, the frame of reference for ProSe include E-UTRAN, EPC, multiple UE, ProSe application servers and ProSe with ProSe application.EPC indicates E-UTRAN core network Framework.EPC may include such as MME, S-GW, P-GW, "Policy and Charging Rules Function (PCRF), home subscriber servers (HSS) Deng entity.ProSe application server is the user for constructing the ProSe ability of application function.In public safety situation Under, they can be particular organization (PSAP), or be social media under state of trade.These applications can be in 3GPP framework Except define, but may be present be directed toward 3GPP entity reference point.Application server can be to the application communication in UE.Answering in UE With the ProSe ability used for constructing application function.Example can be the communication between the member for public safety group Or for requesting in the neighbouring social media application for finding friend.
The ProSe function in network (a part as EPS) of being defined by 3GPP, which has, is directed toward ProSe application service Device, the reference point for being directed toward EPC and UE.The functionality may include at least one of lower list.But the functionality can not It is limited to lower list.
Carry out interworking via the reference point for being directed toward third-party application
For finding and the authorization and configuration of the UE of direct communication
The functionality for allowing EPC rank ProSe to find
The processing of-ProSe related new subscriber data and data storage, there are also the processing of ProSe mark
Safety related functions
The control to EPC is provided for strategy related functionality
The functionality (outside EPC or EPC, such as offline charging) for being used for charging is provided
Description is for reference point/interface in the frame of reference of ProSe.
- PC1: it be in UE and in ProSe application server ProSe application between reference point.It is answered for defining With rank signaling request.
- PC2: it is the reference point between ProSe application server and ProSe function.It is for defining ProSe application Interaction between server and the ProSe provided by 3GPP EPS via ProSe function functionality.One example can be and be used for The application data of ProSe database in ProSe function update.Another example can be to be used for by ProSe application server The data of interworking between 3GPP functionality and application data (for example, Title Translation).
- PC3: it is the reference point between UE and ProSe function.It is used to define the interaction between UE and ProSe function. One example can be the configuration for finding and communicating for ProSe.
- PC4: it is the reference point between EPC and ProSe function.It is used to define the friendship between EPC and ProSe function Mutually.Possible service condition can be when establishing One-to-one communication path between UE or verifying ProSe service in real time When (authorization) is to be used for session management or mobile management.
- PC5: it is UE to the reference point between UE, for control and user plane to be used for for finding and communicate in After device and One-to-one communication (via LTE-Uu between direct and UE between UE).
- PC6: this reference point can be used for such as subscribing to the function of the discovery of the ProSe between the user of different PLMN.
- SGi: other than the correlation function via SGi, it can be used for handing over using data and application level control information It changes.
ProSe direct communication is such a communication pattern, two public safety UE thus can via PC5 interface directly that This communication.When UE is serviced by E-UTRAN and when UE is when except E-UTRA coverage area, this communication pattern is supported.
The UE for enabling ProSe can be operated under two kinds of resources allocation model.In mode 1, resource allocation is dispatched by eNB. In mode 1, UE may need RRC_CONNECTED to send data.UE can request transfer resource to eNB.ENB is adjustable Transfer resource of the degree for the transmission of scheduling assignment and data.UE can be sent out in the backward eNB of ProSe buffer status reporting (BSR) Send scheduling request (specific schedule requests (D-SR) or random access).It is direct for ProSe to can determine that UE has based on BSR, eNB The data of communications and estimate to transmit required resource.In mode 2, UE oneself automatically from resource pool select resource with Send scheduling assignment and data.If UE, outside coverage area, mode 2 can be used only in UE.If UE in coverage area, UE can be according to the configuration use pattern 1 or mode 2 of eNB.When exceptional condition is not present, unless it is configured by eNB, UE can be from Mode 1 changes into mode 2 or slave pattern 2 changes into mode 1.If UE, in coverage area, UE will use only by eNB The mode of configuration instruction, unless one of exception occurs.
ProSe directly has found to be defined as the UE by enabling ProSe and uses with direct using E-UTRA via PC5 interface Radio signal finds the process of the UE of its neighbouring other enabling ProSe.Only just supported when UE is serviced by E-UTRAN ProSe directly has found.
There are two kinds of resource allocations for finding information announcement.Class1 is distributed in such a way that non-UE is specific For finding the resource allocation process of the resource of the notice of information.ENB can provide the resource for finding the notice of information to UE Pond configuration.The configuration can signal in system information block (SIB).UE is automatically wireless from indicated resource pool selection Electric resources and notice discovery information.UE can discovery of the notice about randomly selected discovery resource during each discovery period Information.Type 2 is to distribute the resource allocation process for the resource for finding the notice of information in such a way that every UE is specific.It is in The UE of RRC_CONNECTED can request the resource for finding the notice of information via RRC to eNB.ENB can refer to via RRC Send resource.Resource is distributed in the resource pool that can be configured in the UE for monitoring.
Fig. 8 shows the example of the direct discovery procedure of single step ProSe.In fig. 8, two UE are currently running identical enabling The application of ProSe, and assume that the user of those UE has " friend " relationship using upper what is considered." 3GPP shown in Fig. 8 Layer " corresponds to the functionality specified by 3GPP, and the mobile application in UE is made to be able to use ProSe discovery service.
UE-A and UE-B operation enables the application of ProSe, finds the associated application server in network and is connected thereto. As an example, this application can be social networking application.Application server can take by 3GPP network operator or by third party Business supplier operation.When being operated by third-party vendor, service agreement is needed between third-party vendor and 3GPP operator To allow the ProSe server in 3GPP network and the communication between application server.
1. conventional application layer communication occurs between the application server in the mobile application and network in UE-A.
The application of enabling ProSe in 2.UE-A obtains the column that (retrieve) is known as the application layer identifier of " friend " Table.In general, these identifiers have the form of network access identifier.
3. the application for enabling ProSe is wanted to be notified when one of friend of UE-A is near UE-A.For this purpose, it is to 3GPP The user of layer request (i) UE-A (have and apply layer identification) and the privately owned expression code of (ii) his each friend.
4.3GPP layers are entrusted to request the ProSe server in 3GPP network.This server can be located at Home PLMN (HPLMN) in or in access PLMN (VPLMN).Any ProSe server for supporting considered application can be used.UE with Communication between ProSe server occurs on IP layers or below IP layers.If using or UE be not authorized to use ProSe It was found that then ProSe server refuses the request.
5.ProSe server is by all application layer identity maps provided to privately owned expression code.For example, using layer identification It is mapped to privately owned expression code.This mapping based on from network application server obtain parameter (for example, mapping algorithm, Key etc.), thus derived from privately owned expression code can be globally unique.In other words, any ProSe server is requested The privately owned expression using layer identification of specific application is derived, it will derive identical privately owned expression code.From application server How the mapping parameters of acquisition is mapped if describing.The step for, application in ProSe server and/or network Server also authorizes the request obtained for specific application and the expression code from specific user.Ensure that for example user can Only obtain the expression code of his friend.
6. the expression code derived of mark for all requests is sent to 3GPP layers, they be stored in there with Convenient for future usage.In addition, 3GPP layers of notice enable the application of ProSe, the expression code of requested mark is successfully obtained And application.However, acquired expression code is not sent to the application for enabling ProSe.
7. 3GPP layers of application request that enable ProSe start to find, that is, attempt one of " friend " provided by discovery and exist Near UE-A, therefore direct communication is feasible.In response, UE-A notices the expression using layer identification of considered application Code.This expression code only can be by the expression for also having received considered application of UE-A to the corresponding mapping for applying layer identification The friend of code executes.
8.UE-B also runs the identical application for enabling ProSe and has executed step 3-6 to obtain the expression generation of friend Code.In addition, the 3GPP layer in UE-B executes ProSe discovery after the application request for being activated ProSe.
9. when UE-B, which receives ProSe from UE-A, to be noticed, it is determined that the expression code noticed is known and maps To specific application and apply layer identification.UE-B can determine application corresponding with received expression code and application identities, because The expression code using layer identification is also had received for it (UE-A is included in the list of friends of UE-B).
Step 1-6 in the above process only can be executed just when UE is in network coverage.However, simultaneously infrequently Need these steps.They only need to update or modify the friend Shi Caixu that directly find using ProSe to find in UE It wants.It, can be within network coverage or except network coverage after receiving requested expression code from network Carry out ProSe discovery (step 7 and step 9).
It should be noted that expression code maps to specific application and specific application mark.Therefore, when user is multiple The identical ProSe's in application, each UE notices identical expression code of enabling is run on UE.
Fig. 9 shows the example of the direct discovery procedure of two-step ProSe.
The user of 1.UE1 (finder) wishes to discover whether that there are neighbouring specific group communication service enablers (GCSE) Any member of group.UE1 broadcast disappears comprising the unique of target GCSE group using the target detection request of group ID (or 2 groups of ID of layer) Breath.The unique identifier of the target detection request message person of can further include finding (user's 1 applies individual ID).Target detection request Message is received by UE2, UE3, UE4 and UE5.Other than the user of UE5, every other user be requested GCSE group at Member, UE are configured accordingly.
Each of 2a-2c.UE2, UE3 and UE4 are sent out using the target for the unique application individual ID that may include its user Existing response message comes directly in response to UE1.In contrast, UE5 does not send response message.
During three-wave-length, UE1 can be responded target detection response message by sending discovery confirmation message.
D2D signal can be sent at RRC_IDLE and RRC_CONNECTED by having discussed.In order at RRC_IDLE D2D signal transmission, can at RRC_IDLE newly definition be used for D2D signal radio resource.Accordingly, it may be desirable to a kind of The method of method based on RRC state control D2D operation and/or the applicability according to RRC state control D2D resource.
Embodiment according to the present invention, network can configure D2D resource to UE.Network can correspond to D2D resource using determining UE is configured suitable for the RRC state or RRC state relevant information of which RRC state, correspondingly, UE can determine in a RRC Whether the resource information for D2D operation obtained under state is also applied for another RRC state or radio obtained money Source is suitable for which RRC state (that is, UE is allowed to execute D2D transmission under which RRC state).That is, network can be configured to UE D2D resource, the D2D resource configured and to the use of the D2D resource configured can under specific RRC state effectively and by Limit.The D2D resource configured can be used only under corresponding RRC state.UE D2D operation can according to the validity of D2D resource come It determines.Hereinafter, D2D signal may include D2D discovery at least one of signal/message or D2D communication data.
Figure 10 shows the example of the method for the transmission D2D signal of embodiment according to the present invention.In step S100, UE receives the D2D resource of the transmission for D2D signal at RRC_IDLE.In step s 110, UE is utilized at RRC_IDLE The D2D resource sends D2D signal.It is contemplated that the validity of the D2D resource configured at RRC_IDLE according to RRC state And/or the various situations of applicability.
(1) network can configure D2D resource via broadcast signaling at RRC_IDLE, and the D2D resource configured can only exist Under RRC_IDLE effectively.UE utilizes configured D2D resource to execute D2D operation at RRC_IDLE, but when UE enters RRC_ When CONNECTED, the D2D resource configured can be considered at RRC_CONNECTED invalid.It is only permitted in RRC_ The UE that the transmission of D2D signal is carried out under CONNECTED is believed that it is only permitted specially distributing D2D resource to UE by network The transmission of D2D signal is executed later.Therefore, UE can only at RRC_IDLE using the D2D resource configured at RRC_IDLE come Send D2D signal.UE can only receive D2D signal at RRC_IDLE using the D2D resource configured at RRC_IDLE.Extensively Broadcasting signaling can be system information, the system information block type 18 (SIB18) newly defined especially for D2D resource.
In addition, the applicability of the D2D resource configured under RRC_IDLE can be further limited in.For example, at RRC_IDLE The D2D resource of configuration can be only applicable to the RRC_IDLE under specified conditions.The specified conditions can be predefined condition, or Person's network can configure the specified conditions.The predefined condition may include UE can not be into since failure is established in RRC connection The case where entering RRC_CONNECTED.The predefined condition may also include UE due to not being able to maintain RRC_CONNECTED (example Such as, radio bearer setup complete) and the case where subsequently enter RRC_IDLE.
For example, UE can receive the D2D resource of the autonomous transmission for D2D signal at RRC_IDLE, and can only exist The D2D resource is used under RRC_IDLE.Received D2D resource can be considered invalid at RRC_CONNECTED.With It can be the above-mentioned Class1 autonomous transmission resource pool for D2D discovery in the D2D resource of the autonomous transmission of D2D signal.That is, with It can be the notice for finding information distributed in such a way that non-UE is specific in the D2D resource of the autonomous transmission of D2D signal Resource.Alternatively, the D2D resource of the autonomous transmission for D2D signal can be above-mentioned 2 autonomous transmission of mode for D2D communication Resource pool.That is, the D2D resource of the autonomous transmission for D2D signal can be the resource that UE oneself selects resource from it.
(2) network can configure D2D resource via broadcast signaling at RRC_IDLE, and the D2D resource configured can be in RRC_ Under IDLE and RRC_CONNECTED the two effectively.UE configured D2D resource is utilized at RRC_IDLE come execute D2D operation, And even if the D2D resource configured is also contemplated as at RRC_CONNECTED after UE enters RRC_CONNECTED Effectively.In this case, D2D resource can be considered at RRC_CONNECTED effectively, until UE receives RRC connection weight Until new configuration message.Therefore, UE can be under RRC_IDLE and RRC_CONNECTED the two using configuring at RRC_IDLE D2D resource sends D2D signal.UE can be utilized under RRC_IDLE and RRC_CONNECTED the two and be configured at RRC_IDLE D2D resource receive D2D signal.Broadcast signaling can be system information, especially SIB18.
After receiving RRC connection and reconfiguring message, UE can be reconfigured according to RRC connection the configuration in message come Execute D2D operation.If it includes dedicated D2D resource that RRC connection, which reconfigures message, UE according to the dedicated D2D resource come Execute D2D operation.If it includes any dedicated D2D resource that RRC connection, which reconfigures message not, UE can stop D2D operation.Separately Selection of land, if it includes any dedicated D2D resource that RRC connection, which reconfigures message not, but RRC connection reconfigures message instruction UE can continue to use the available D2D resource before receiving RRC connection and reconfiguring message, then UE can continue to use D2D resource To execute D2D operation.
(3) network can configure D2D resource via broadcast signaling at RRC_IDLE, and the D2D resource configured can only exist Under RRC_CONNECTED effectively.This situation the embodiment described in Figure 10 may not cover.When UE enters RRC_ When CONNECTED, the D2D resource configured can be considered at RRC_CONNECTED effective.Therefore, if D2D resource is For the resource that D2D is sent, then UE can only be sent out at RRC_CONNECTED using the D2D resource configured at RRC_IDLE Send D2D signal.If D2D resource is for the received resource of D2D, UE can be utilized only at RRC_CONNECTED The D2D resource that configures under RRC_IDLE receives D2D signal.Broadcast signaling can be system information, especially SIB18.
In addition, the D2D that RRC_CONNECTED is signaled but be suitable under RRC_IDLE can be further limited in The applicability of resource.For example, the D2D resource configured at RRC_IDLE can be only applicable to the RRC_ under specified conditions CONNECTED.The specified conditions can be predefined condition or network can configure the specified conditions.It is described predetermined The condition of justice may include that UE thinks that current RRC connects problematic situation.When radio bearer setup complete occurs or when generation When physical layer problem, UE is believed that current RRC connection is problematic.
In addition, the D2D that RRC_CONNECTED is signaled but be suitable under RRC_IDLE can be further limited in The applicability of resource.For example, UE only can be configured to make by the D2D resource configured at RRC_IDLE in network via dedicated signaling Just become applicable when with D2D resource.Network can match UE during RRC connection establishment process or RRC connection reconfiguration procedure It is set to and uses D2D resource.Simple instruction (for example, a bit indicator) can be used for the configuration.
Figure 11 shows the example of the method for the transmission D2D signal of another embodiment according to the present invention.In step S200 In, UE receives the D2D resource of the transmission for D2D signal at RRC_CONNECTED.In step s 110, UE is in RRC_ D2D signal is sent under IDLE using D2D resource.It is contemplated that being provided according to the D2D that RRC state is configured at RRC_CONNECTED The validity in source and/or the various situations of applicability.
(1) network can configure D2D resource via dedicated signaling at RRC_CONNECTED, and the D2D resource configured can Only at RRC_IDLE effectively.Network can reconfigure message via RRC connection at RRC_CONNECTED to configure D2D money Source, and can indicate that configured D2D resource is only effective at RRC_IDLE to UE.Alternatively, network can be in RRC_ D2D resource is configured under CONNECTED via RRC connection release message, and the D2D resource configured can be in RRC_IDLE Lower use.Therefore, UE can only send D2D letter at RRC_IDLE using the D2D resource configured at RRC_CONNECTED Number.UE can only receive D2D signal at RRC_IDLE using the D2D resource configured at RRC_CONNECTED.It is described special It may include that the configured D2D resource of instruction is effectively explicitly indicated under RRC_IDLE and RRC_CONNECTED the two with signaling (for example, RRC state mark).Alternatively, dedicated signaling itself can be used as indicating configured D2D resource in RRC_IDLE and Effective implicit indication under RRC_CONNECTED the two.RRC connection reconfigures message or RRC connection release message is only shape State changes the example of message, and the invention is not limited thereto.
(2) network can configure D2D resource via dedicated signaling at RRC_CONNECTED, and the D2D money configured It source can be under RRC_IDLE and RRC_CONNECTED the two effectively.Network can be at RRC_CONNECTED via RRC connection weight It is new to configure message to configure D2D resource, and configured D2D resource can be indicated in RRC_IDLE and RRC_ to UE Under CONNECTED the two effectively.Therefore, UE can be under RRC_IDLE and RRC_CONNECTED the two using in RRC_ The D2D resource that configures under CONNECTED sends D2D signal.UE can be sharp under RRC_IDLE and RRC_CONNECTED the two The D2D resource that configures under RRC_CONNECTED receives D2D signal.
For example, UE can receive the D2D resource of the autonomous transmission for D2D signal at RRC_CONNECTED, and can be The D2D resource is used under RRC_CONNECTED and RRC_IDLE the two.The D2D resource of autonomous transmission for D2D signal can To be the above-mentioned Class1 autonomous transmission resource pool for D2D discovery.That is, the D2D resource of the autonomous transmission for D2D signal can Resource to be the notice for finding information distributed in such a way that non-UE is specific.Alternatively, being used for the autonomous transmission of D2D signal D2D resource can be the above-mentioned 2 autonomous transmission resource pool of mode for D2D communication.That is, being used for the autonomous biography of D2D signal Defeated D2D resource can be the resource that UE oneself selects resource from it.
Network can configure D2D resource using validity timer at RRC_CONNECTED via dedicated signaling.Effectively Property timer can the starting when receiving D2D resource.Validity timer can be continued to run when UE enters RRC_IDLE.D2D Resource can be considered only effective while the operation of validity timer.When validity timer expiration, UE can drop D2D money Source is as the resource being applicable at RRC_IDLE.Alternatively, validity timer generating state can turn after receiving D2D resource Become Shi Qidong.If not providing validity timer value, once D2D resource can be considered receiving D2D money only for UE Source, the RRC_IDLE to arrive first are effective.Once UE enters RRC_CONNECTED, UE can drop D2D resource and be used as in RRC_ The resource being applicable under IDLE.
For example, UE can receive the D2D resource by network scheduling at RRC_CONNECTED, and can be in RRC_ D2D resource is used under CONNECTED and RRC_IDLE the two.At RRC_IDLE, D2D resource can refer to by validity timer It is used in the specific duration shown.It can be the above-mentioned scheduling of type 2 for D2D discovery by the D2D resource of network scheduling to pass Defeated resource pool.That is, can be the notice for being used to find information distributed in such a way that every UE is specific by the D2D resource of network scheduling Resource.Alternatively, can be the above-mentioned 1 scheduling transmission resources pond of mode for D2D communication by the D2D resource of network scheduling.
Alternatively, whether network can be with regard to UE under RRC_IDLE and RRC_CONNECTED the two or only in RRC_ The money that the transmission for D2D signal reserve/was allowed to or became known for the transmission of D2D signal is allowed to use under CONNECTED Source configures UE.Then, if UE is configured so that UE is not allowed to use at RRC_IDLE for D2D signal by network Transmission reserve/be allowed to or become known for D2D signal transmission resource, then UE thinks to know even if UE for D2D signal Transmission reserve/become known for D2D signal transmission resource, do not allow the transmission of D2D signal at RRC_IDLE yet, and UE thinks the transmission for only just allowing D2D signal at RRC_CONNECTED.
Hereinafter, the method for handling D2D resource in RRC state transformation of description embodiment according to the present invention.It may , in RRC state transformation, D2D resource is considered invalid (that is, unavailable), and UE can suspend and be carried out using D2D resource D2D operation.RRC state transformation from RRC_IDLE to RRC_CONNECTED is attempted for UE and UE makes at RRC_IDLE With D2D resource, once UE starts RRC connection establishment process, UE is just believed that D2D resource inefficiencies.This can correspond to institute in Figure 10 The embodiment stated.The initiation that RRC connection is established can be defined by sending RACH lead code.
Once resource is dropped (that is, being considered invalid), UE is believed that the D2D resource being dropped is effective again.UE can recognize For the D2D resource that is dropped under the conditions of as described below various effectively.
If connection is successfully established completion, UE is believed that invalid D2D resource is effective.
If connection is successfully established completion and cell indicates during RRC connection establishment process (for example, connecting in RRC Connecing in setting message) UE is allowed to think that abandoned D2D resource is effective, then UE is believed that invalid D2D resource is effective.
If connection is successfully established completion, then the first re-configuration process is successfully completed, then UE is believed that invalid D2D resource is effective.
If connection is successfully established completion, then the first re-configuration process is successfully completed, and cell instruction is in RRC (for example, reconfiguring in message in RRC connection), UE is allowed to think abandoned D2D resource during connection re-configuration process Effectively, then UE is believed that invalid D2D resource is effective.
RRC state transformation from RRC_CONNECTED to RRC_IDLE and UE are attempted in RRC_ for UE D2D resource is used under CONNECTED, can be taken one thing with another as described below.
Once UE enters RRC_IDLE, the D2D resource that the discardable default of UE is used at RRC_CONNECTED.
Once UE enters RRC_IDLE, if network sends the RRC connection release message of the discarding including D2D resource, UE can drop D2D resource.
Once UE enters RRC_IDLE, UE can not abandon D2D resource, that is, the D2D used at RRC_CONNECTED Resource is also used at RRC_IDLE.This can correspond to embodiment described in Figure 11.
Once UE enters RRC_IDLE, if it includes continuing to use D2D resource (that is, in RRC_ that network, which is sent, The D2D resource used under CONNECTED is also used at RRC_IDLE) RRC connection release message, then UE can not abandon D2D Resource.This can also correspond to embodiment described in Figure 11.
Once UE enters RRC_IDLE, if network sends the RRC of the D2D resource including that can use at RRC_IDLE Connection release message, then UE can not abandon D2D resource.This can also correspond to embodiment described in Figure 11.
Once UE enters RRC_IDLE, if the D2D resource used at RRC_CONNECTED by UE is not can be The subset of the D2D resource used under RRC_IDLE, then UE can drop D2D resource.UE can be by reference to indicated in system information D2D resource for RRC_IDLE and the D2D money for RRC_CONNECED that is indicated by system information or dedicated signaling Source identifies this condition.
Once UE enters RRC_IDLE, UE can only abandon by UE at RRC_CONNECTED using but not with can be The overlapping D2D resource of the D2D resource used under RRC_IDLE.Therefore, UE can be continued to use is made at RRC_CONNECTED by UE With and D2D resource not overlapping with the D2D resource that can be used at RRC_IDLE.UE can be by reference to signified in system information The D2D resource for RRC_IDLE shown and the D2D for RRC_CONNECED that is indicated by system information or dedicated signaling Resource identifies this condition.
When abandoning D2D resource, UE, which can suspend, sends and utilizes both receptions of D2D resource using the D2D of D2D resource. Alternatively, UE can only suspend the D2D transmission using D2D resource, and continue with the reception of D2D resource.If the D2D abandoned Resource is thought that effectively then UE can restart the D2D operation of pause again.
When UE detects that this can be indicated to the upper layer of responsible D2D service by UE there is no when applicable D2D resource.It is described Upper layer can be responsible for scheduling or resource allocation and perhaps be responsible for the layer of totality UE adjacent service or can manage overall D2D service Application layer.When UE detects the presence of applicable D2D resource, this can be indicated to the upper layer of responsible D2D resource by UE.
Figure 12 is the block diagram for showing the wireless communication system for realizing embodiments of the present invention.
The entity of network 800 may include processor 810, memory 820 and radio frequency (RF) unit 830.Processor 810 can It is configured as realizing proposed function, process and/or method described in this specification.The layer of radio interface protocol can quilt It realizes in processor 810.Memory 820 operationally couples with processor 810 and stores various information with operation processing Device 810.RF unit 830 operationally couples with processor 810 and sends and/or receive radio signal.
UE 900 may include processor 910, memory 920 and RF unit 930.Processor 910 can be configured to realize this Function, process and/or the method proposed described in specification.The layer of radio interface protocol can be implemented in processor In 910.Memory 920 operationally couples with processor 910 and stores various information with operation processing device 910.RF unit 930 operationally couple with processor 910 and send and/or receive radio signal.
Processor 810,910 may include at specific integrated circuit (ASIC), other chipsets, logic circuit and/or data Manage device.Memory 820,920 may include read-only memory (ROM), random access memory (RAM), flash memory, storage card, deposit Storage media and/or other storage devices.RF unit 830,930 may include baseband circuit to handle radiofrequency signal.Work as embodiment When being implemented in software, the techniques described herein can be using the module of execution function as described herein (for example, process, function Deng) Lai Shixian.The module can be stored in memory 820,920 and be executed by processor 810,910.Memory 820, 920 can be implemented in processor 810,910 or outside processor 810,910, in this case, memory 820,920 Processor 810,910 can be attached in communication via various means known in the art.
In view of exemplary system as described herein, describing with reference to multiple flow charts can realize according to disclosed theme Method.Although for purposes of simplicity, method is shown and described as series of steps or box, it will be understood that and recognize, Claimed theme is not limited by the sequence of these steps or box, because relative to depicted and described herein, one A little steps can occur in a different order or occur simultaneously with other steps.Further, it will be understood by those skilled in the art that stream Journey step as shown in the figure be not it is exclusive, do not influence the scope of the present disclosure and spirit in the case where, it may include Qi Tabu One or more steps in rapid or example flow diagram can be deleted.

Claims (8)

1. a kind of use the method for device to the device D2D resource operated by user equipment (UE) in a wireless communication system, Method includes the following steps:
When under radio resource control RRC idle mode:
Autonomous transmission resource pool from network via System Information reception for D2D discovery signal, and
The D2D discovery signal is sent according to the autonomous transmission resource pool for D2D discovery signal；And
Enter RRC connection mode from the RRC idle mode,
Wherein, the autonomous transmission resource pool for D2D discovery signal is only used under the RRC idle mode, And enter the RRC connection mode after be it is invalid,
Wherein, if connection establishment process successfully completes and the network indicates the UE during the connection establishment process It being allowed to think that the invalid autonomous transmission resource pool is effective, then the invalid autonomous transmission resource pool is effective again, and And
Wherein, the system information corresponds to the system information block SIB for D2D discovery signal definition.
2. according to the method described in claim 1, wherein, the SIB is system information block type 18.
3. according to the method described in claim 1, wherein, the autonomous transmission resource pool pair of signal is found for the D2D The resource for being used to notice discovery information that Ying Yu is distributed in such a way that non-UE is specific.
4. according to the method described in claim 1, this method is further comprising the steps of: when under the RRC connection mode:
The D2D resource for sending the D2D discovery signal under the RRC connection mode is received via dedicated signaling；And
The D2D is sent according to the D2D resource for sending the D2D discovery signal under the RRC connection mode It was found that signal.
5. the user equipment (UE) in a kind of wireless communication system, the UE include:
Radio frequency unit；And
Processor, the processor are attached to the RF unit and are configured as:
When under radio resource control RRC idle mode:
It controls the RF unit and is provided from network via System Information reception for autonomous transmission of the device to device D2D discovery signal Source pond, and
The RF unit is controlled to be sent out according to the autonomous transmission resource pool for D2D discovery signal to send the D2D Existing signal；And
Enter RRC connection mode from the RRC idle mode,
Wherein, the autonomous transmission resource pool for D2D discovery signal is only used under the RRC idle mode, And enter the RRC connection mode after be it is invalid,
Wherein, if connection establishment process successfully completes and the network indicates the UE during the connection establishment process It being allowed to think that the invalid autonomous transmission resource pool is effective, then the invalid autonomous transmission resource pool is effective again, and And
Wherein, the system information corresponds to the system information block SIB for D2D discovery signal definition.
6. UE according to claim 5, wherein the SIB is system information block type 18.
7. UE according to claim 5, wherein the autonomous transmission resource pool for D2D discovery signal is corresponding The resource for being used to notice discovery information that the specific mode of Yu Yifei UE is distributed.
8. UE according to claim 5, wherein the processor is also configured under the RRC connection mode When, control the RF unit:
The D2D resource for sending the D2D discovery signal under the RRC connection mode is received via dedicated signaling；And
The D2D is sent according to the D2D resource for sending the D2D discovery signal under the RRC connection mode It was found that signal.
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